private Expression readExpression()
{
Console.WriteLine(" 1: Const Expression\n 2: Var Expression\n 3: Arith Expression");
int c = Convert.ToInt32(Console.ReadLine());
if (c == 1)
{
Console.WriteLine("Input constant expression");
ConstExpression cx = new ConstExpression(Convert.ToInt32(Console.ReadLine()));
return((Expression)cx);
}
else if (c == 2)
{
Console.WriteLine("Input variable expression");
VarExpression ve = new VarExpression(Console.ReadLine());
return((Expression)ve);
}
else if (c == 3)
{
ArithExpression ae = new ArithExpression();
Console.WriteLine("Input left expression");
ae.setL(readExpression());
Console.WriteLine("Input operator");
ae.setOp(Console.ReadLine()[0]);
Console.WriteLine("Input right expression");
ae.setR(readExpression());
return((Expression)ae);
}
return(null);
}
void ButtonSubmitArithmeticClick(object sender, EventArgs e)
{
String operand = textBoxArithmeticOperand.Text;
ArithExpression ae = new ArithExpression();
ae.setL(leftExpression);
ae.setOp(operand[0]);
ae.setR(rightExpression);
expression = ae;
finished();
}